1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 12573:2010Aircraft Tubing tolerances Inch seriesBS ISO 12573:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 12573:2010.The UK
2、participation in its preparation was entrusted to TechnicalCommittee ACE/69, Aerospace hydraulic systems, fluids andcomponents.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of
3、a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 64200 5ICS 49.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 September
4、2010.Amendments issued since publicationDate Text affectedBS ISO 12573:2010Reference numberISO 12573:2010(E)ISO 2010INTERNATIONAL STANDARD ISO12573First edition2010-09-15Aircraft Tubing tolerances Inch series Aronefs Tolrances de tuyauterie Srie en inches BS ISO 12573:2010ISO 12573:2010(E) PDF discl
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8、CTED DOCUMENT ISO 2010 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs me
9、mber body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 12573:2010ISO 12573:2010(E) ISO 2010 All rights reserv
10、ed iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Tubes in titanium and titanium alloys .4 4.1 Dimensions 4 4.2 Tolerances4 5 Tubes in aluminium alloys5 5.1 Dimensions 5 5.2 Tolerances6 6 Tubes in corrosion resistant steel (CRES) .7 6.1 Dime
11、nsions 7 6.2 Tolerances7 7 Tubes in nickel alloys .8 7.1 Dimensions 8 7.2 Tolerances9 BS ISO 12573:2010ISO 12573:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wo
12、rk of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governm
13、ental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The
14、main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
15、Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12573 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC
16、 10, Aerospace fluid systems and components. BS ISO 12573:2010ISO 12573:2010(E) ISO 2010 All rights reserved vIntroduction The purpose of this International Standard is to harmonize the dimensional tolerances used in the preparation of aerospace tubing. It is intended that future aerospace tubing st
17、andards refer to this International Standard for the purpose of defining dimensional tolerances. International Standards use the International System of units (SI); however, large segments of the aerospace industry make use of other measurement systems as a matter of common working practice. The tit
18、le of this International Standard (“Inch series”) reflects the fact that nominal sizes (see definition 3.1), which are in common use in the aerospace industry, were originally defined in terms of fractional inches. Although tube sizes were originally defined (and are frequently cited) using non-SI u
19、nits, all dimensions used in this International Standard are given in SI units, with inch units also indicated for the convenience of the user. The decimal sign used in International Standards is the comma (“,”); however, the comma is not used in common working practice for inch dimensions. Therefor
20、e, in common with many other aerospace standards, the decimal point is used in this International Standard when providing dimensions in inches. NOTE The use of non-SI units and the decimal point in this International Standard does not constitute general acceptance of measurement systems other than S
21、I within International Standards. BS ISO 12573:2010BS ISO 12573:2010INTERNATIONAL STANDARD ISO 12573:2010(E) ISO 2010 All rights reserved 1Aircraft Tubing tolerances Inch series 1 Scope This International Standard specifies the dimensional tolerances to be applied to round section inch series tubing
22、 used in aircraft. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 857
23、5, Aerospace Fluid systems Hydraulic system tubing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 nominal size dash number dNnon-dimensional characteristic which identifies the size of the parts of a fluid system NOTE For a tube, the nominal
24、 size corresponds to the nominal value of the outside diameter, expressed in sixteenths of an inch (1,59 mm). EXAMPLE 04 corresponds to 4/16 in = 0.250 in = 6,35 mm. 3.2 outside diameter d1distance between any two points at 180 to each other around the outside of a single section across the tube NOT
25、E Unless otherwise specified, the limits on the outside diameter therefore include all allowances for ovality (lack of circularity). See Figure 1. BS ISO 12573:2010ISO 12573:2010(E) 2 ISO 2010 All rights reservedKey d1outside diameter d2inside diameter t wall thickness Figure 1 Outside diameter, ins
26、ide diameter and wall thickness 3.3 mean outside diameter arithmetic mean of two measurements of the outside diameter, taken at right angles to each other around a single section across the tube NOTE Where a mean outside diameter is specified, a limitation on ovality is also specified. See Figure 2.
27、 Key d1,maxmaximum outside diameter d1,minminimum outside diameter mean outside diameter: 1, m a x 1,m i n2ddovality: 1,m a x 1,m i ndd Figure 2 Mean outside diameter and ovality 3.4 inside diameter d2distance between any two points at 180 to each other around the inside of a single section across t
28、he tube NOTE Unless otherwise specified, the limits on the inside diameter shall include all allowances for ovality (lack of circularity). See Figure 1. BS ISO 12573:2010ISO 12573:2010(E) ISO 2010 All rights reserved 33.5 wall thickness t thickness measured at a right angle across the tube wall See
29、Figure 1. 3.6 ovality difference between the larger and smaller measures of the outside diameter where these are taken at right angles to each other around a single section across the tube See Figure 2. 3.7 concentricity lack of coaxiality axis of the outside diameter being non-coincident with the a
30、xis of the inside diameter NOTE As the position of the axes is difficult to determine in practice, it is defined as half the variation in wall thickness at any two points at 180 to each other around a single section of the tube. Unless otherwise specified, the allowance for concentricity is containe
31、d with the permitted variation of wall thickness. See Figure 3. Key tmaxmaximum wall thickness tminminimum wall thickness aconcentricity: max min2ttFigure 3 Concentricity 3.8 straightness maximum curvature (depth of arc) permissible in a specified length See Figure 4. BS ISO 12573:2010ISO 12573:2010
32、(E) 4 ISO 2010 All rights reservedKey depth of arc Figure 4 Straightness 4 Tubes in titanium and titanium alloys 4.1 Dimensions For nominal sizes and thicknesses, the standard dimensions shall be as given in ISO 8575. 4.2 Tolerances 4.2.1 General It is usual practice to specify tolerances on the out
33、side diameter and one of the other two dimensional characteristics, i.e. the inside diameter and the wall thickness. Where other specifications refer to this specification for tolerances, they shall make clear whether 4.2.3 or 4.2.4, or in special cases both, are applicable. 4.2.2 Tolerances on the
34、outside diameter Unless otherwise specified in the order, the tolerances on the outside diameter shall be as shown in Table 1. Table 1 Outside diameter tolerances Titanium tubes Tolerances on outside diameter Nominal size dNmm in dNu 06 0,0760+0.0030+06 dNu 10 0,1020+0.0040+10 dNu 12 0,1020,025+0.00
35、40.001+12 dNu 24 0,1020,051+0.0040.002+24 dNu 32 0,1300,050+0.0050.002+4.2.3 Tolerances on inside diameter Unless otherwise specified in the order, the tolerances on the inside diameter shall be as shown in Table 2. BS ISO 12573:2010ISO 12573:2010(E) ISO 2010 All rights reserved 5Table 2 Inside diam
36、eter tolerances Titanium tubes Tolerances on inside diameter Nominal size dNmm in dNu 06 0,038 0.001 5 06 dNu 08 0,051 0.002 0 08 dNu 12 0,064 0.002 5 12 dNu 20 0,076 0.003 0 20 dNu 32 0,102 0.004 0 4.2.4 Tolerances on wall thickness Unless otherwise specified in the order, the actual thickness shal
37、l be not less than 95 % of the nominal thickness. 4.2.5 Tolerances on ovality Unless otherwise specified in the order, the maximum and minimum values of the outside diameter shall remain within the limits in Table 1 and there shall be no additional allowance for ovality. 4.2.6 Tolerances on concentr
38、icity Unless otherwise specified in the order, no additional concentricity shall be permitted beyond the limits of wall thickness defined in 4.2.4. 4.2.7 Tolerances on straightness Unless otherwise specified in the order, the tube shall be of such straightness that the maximum curvature (depth of ar
39、c) shall not exceed the limits set out in Table 3. Table 3 Straightness tolerances Titanium tubes Tube length Maximum permissible depth of arc mm in mm in 300 12 0,62 0.025 1 500 60 3,00 0.125 4.2.8 Tolerances on fixed lengths Unless otherwise specified in the order, for tube ordered in fixed length
40、s of less than 7,3 m (24 ft), the tolerance on length shall be () ( )3,2 0.12500mm in .+5 Tubes in aluminium alloys 5.1 Dimensions For nominal sizes and thicknesses, the standard dimensions shall be as given in ISO 8575. BS ISO 12573:2010ISO 12573:2010(E) 6 ISO 2010 All rights reserved5.2 Tolerances
41、 5.2.1 Tolerances on outside diameter Unless otherwise specified in the order, the tolerances on the outside diameter shall be as shown in Table 4. Table 4 Outside diameter tolerances Aluminium alloy tubes Tolerances on outside diameter Nominal size dNmm in dNu 08 0,08 0.003 08 dNu 16 0,10 0.004 16
42、dNu 32 0,13 0.005 32 dNu 48 0,15 0.006 5.2.2 Tolerances on wall thickness Unless otherwise specified in the order, the tolerance on wall thickness shall be as shown in Table 5. Table 5 Wall thickness tolerances Aluminium alloy tubes Nominal wall thickness of tube Tolerances on wall thickness mm in m
43、m in 0,25 t u 0,89 0.010 t u 0.035 0,05 0.002 0,89 t u 1,24 0.035 t u 0.049 0,08 0.003 1,24 t u 2,11 0.049 t u 0.083 0,10 0.004 2,11 t u 3,05 0.083 t u 0.120 0,13 0.005 5.2.3 Tolerances on ovality Unless otherwise specified in the order, the maximum and minimum values of the outside diameter shall r
44、emain within the limits in Table 3 and there shall be no additional allowance for ovality, except where wall thickness is less than 3 % of the outside diameter. In such cases, the values of Table 3 are taken to represent the limits of mean outside diameter and an additional 1 % ovality may be permit
45、ted. 5.2.4 Tolerances on concentricity Unless otherwise specified in the order, no additional concentricity shall be permitted beyond the limits of wall thickness defined in Table 5. 5.2.5 Tolerances on straightness Unless otherwise specified in the order, the tube shall be of such straightness that
46、 the maximum curvature (depth of arc) shall not exceed the limits specified in Table 6. BS ISO 12573:2010ISO 12573:2010(E) ISO 2010 All rights reserved 7Table 6 Straightness tolerances Aluminium alloy tubes Maximum permissible depth of arc Tube size (in 1 m length) mm (in 12 in length) in dNu 06 2,1
47、0 0.025 06 dNu 40 0,83 0.010 5.2.6 Tolerances on fixed lengths For tube ordered in fixed lengths of 3,7 m (12 ft) or less, the tolerance on length shall be: () ( )3,2 0.12500mm in .+For tube ordered in fixed lengths of 7,3 m (24 ft) or less, the tolerance on length shall be: () ( )6,3 0.25000mm in .
48、+6 Tubes in corrosion resistant steel (CRES) 6.1 Dimensions For nominal sizes and thicknesses, the standard dimensions shall be as given in ISO 8575. 6.2 Tolerances 6.2.1 Tolerances on outside diameter Unless otherwise specified in the order, the tolerances on the outside diameter shall be as shown
49、in Table 7. Table 7 Outside diameter tolerances CRES tubes Tolerances on outside diameter Nominal size dNmm in dNu 08 0,08 0.003 08 dNu 16 0,10 0.004 16 dNu 24 0,13 0.005 24 dNu 32 0,15 0.006 32 dNu 40 0,20 0.007 40 dNu 48 0,25 0.010 6.2.2 Tolerances on thickness Unless otherwise specified in the order, the tolerance on thic
